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Is it secure to update iOS when using public WiFi? Is there a chance the update is manipulated?

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    With hotel WiFi, security isn't the issue - the connection dropping out before completion would be bigger cause for concern. Wait til you get home.
    – Tetsujin
    Oct 5, 2017 at 18:10
  • The iOS upload is >2Gb in size, and as @tetsujin mentions, the hotel Wi-Fi may stop the upload due to data capping or just generic slowness. If you do want to give it a try, download an iOS speed test app and run a few iterations to see if the Wi-Fi connection is not only fast, but reliable. I use the FCC Speed Test (there are others) which measures Upload/Download speeds, along with with latency and loss. High numbers in upload & download is good; high numbers in latency and loss is bad.
    – IconDaemon
    Oct 5, 2017 at 18:46

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iOS updates are cryptographically signed by Apple - one among a whole slew of integrity and security measures in iOS (PDF document, see section "System Software Authorization"). If something modifies the update over the air, the update will fail to validate, and iOS will not apply the update.

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